Air cooled brake disc



Jul 30, 1968 H HODKINSON 3,394,780

AIR coOLED BRAKE DISC Fi1ed July 18, 1966 tJnited States Patent 3,34,780 AIR oooLED BRAKE DISC 11ofold f1odkfnsoo, Efnhon1, neof Covenffy, England, os-

sfgnof fo 1)unIop 1fobbef conpony Limffed, London, 1fngland, o cofpofafion of (;feaf Bffaio Efled July 18, 1966, Sof. No. os,899 Clofms pffofffy, appHcaon Great Bfffain, July 21, 1965, 30,,29/os o C1ofms. (CL 188Z18) ABSTRACT oE THE DISCLoSURE 1his invention felateS to a, nevv and in1pfoved ventilated bfake diso having ventilation paSSageS Which extend ffom the outer to the inner pefiphery of the orako disc to provido fo1 cifcLllation of cooling aiT So that the bfake ten1 peratufe at the opposito braking SUTfaceS of the diSc afe subStantially equaHZed.

This invention felateS to diSo bTakeS, and pa rticularly t() rotatable bfake dfsos foI diSc bfake aSSen1blieS.

()ne conventional fofn1 of bTako diSc fof a diSc brake aSSem bly conlpfiSes an outer annufar disc portion su ported by a central dished body poTtion. In heavy-doty applicationS, it is convention1 proctico to pTovide fadi allyextending ventnation pasSageS in the annular outel diSc poffion, the pasSageS each having an opening at tho outer pe Ti heTa1 edge of the outer diSc ortion and another opening at the inner pefipheTal edge, in of ad iacent the inside surface of tho central diS hed poftion,

()ne obiecf of the present invention iS to pTovide a brake diSc having an iIIIpToved arfangen1ent of ventilation passages.

Accofding to one aSpoct of the invention, a bTake diSc conlpriSoS an annulaf outor diSc 1)offion and a centTal body portion, the disc poftion having a SerieS of ventila tion PaSSageS fofIned thofein, the paSSageS extending ffon1 openingS at the outer peripheTy to openings at the inner peTiphery of the disc poftion, Some of the openings at the innef pe fipheTy being at one Side of the central ody pof tion and otheTS of these openings being at the otheT side of the centTal body poTfion.

AccoTding to anothef aSpect of the invention, a f)fake diSc con1pTiSeS an ann'ular outer diso portion and a cen tfal diShed body portion, the diSc portion having a SeTies of ventilation paSSages foTIled thefein, the paSSageS ex tending ffon1 openingS at the outer pefiphery to openingS at the inner periphefy of the diSc poftion, SoIT1e of the openings at the innef peripheTy of the disc poftion being fofIned in of adiacenf the inSfde SI1 Tfaco of the diShed pof tion of the brake disc and otheTS of theSe openingS being formed in o1 adiacent the ootSide SuffoCe of the diShed porion of the bfake diSc.

Preferobly, the openingS in of adiacent the inside S11rface of the dished porfion of the brake diso aTe aTTanged alternately With the openings in of adiacent the ootside Surface of the diShed poffion of the brake disc.

()ne eInbodiTnent of the invention vvill novv be deScrfbed by vvay of exaTnple, vith refeTence to the acconlpanying drawings in Whioh= FIGURE 1 is an elevation of a bfake disc accoTding to the invention viowed in tho axial difection, paftly clltavvay to shovv the interior of the diSc;

FIGURE Z iS a Section of the brake diSc Shovn in FIG- IJRE L taken on the Hne AA.

The bTake disc 1 conlpriSes an annular oute1 diSc portion 2 caSt integTally vith a oentral diShed body poftion 3, by vvhich it can be fotatably noUnted on a vehicle axle (not shovvn). The diSo portion iS foTn]ed With ventilation passages 4 Which each eXtend in a direction which iS in- 3,394,780 Pafenfed Ju1y 30, 1968 Clined vith reSpect to the difection of the adiacent fadioS of the bfake diSc, tho angle of inclination being sobStantially 30, and aTe aTranged afound the vvhole offcuInferenco of the diSc, adacent pasSageS being Spaced apart equany ffoIn one aJ1otheT and separated by relatfvely nar- Tow 1ibS 5 formed in the caSting, Each paSSage iS alSo pfo vided vvith ono of Inofe feinfofcing 1ibS o diSpoSed within tho respective paSSages botvveen the fibS 5.

The oute1 ends of the paSSages 4 oInefgo at the oufer periphefy of the disc portion Z, and alteTnate paSSageS havo openingS 7 at the inner pefiphery of the diSc poftion adjacent the outSide Soffaco of the dished poftion 3 of tho disc. The reIT1^aining paSSageS flave openings 8 fofoled in the in side sorface of the diShed poftion of tho disc neaf the line of iunction between the diSc and the diShed poTtion.

By providing oponings altoTnately in of adiacent the inSide and oIfside SurfaceS of the centTal diShed f)ody poftion of the diSc Sevefal im oTtant advantages afe obtained.

In fhe conventiona1 ventilatod diSc having a diShed Shape, Whefe aH the radiaHy inneT openings to tho venti1a tion paSSageS are in of adjacent tho inSido surface of tho (body poftion of the disc, the side of the disc poftion vVhich iS axiaHy furthof ffom the base of the central diShed oody poftion is only connected fo the body portion by the ribS fofIned in tho caSting betWeen tho ventilation pasSageS, vvheTeaS the Side of tho disc aXiany neafex to the baSe of the cenfral dished body portion is connected difectly to the body poftion aTound the whole of its innef cifcUInfoTence. Heat can thofofore f fow eaSily fTonl the nearer side of the disc into the 'body poTtion, thus pfoviding iIn proved cooling fo1 thiS Side of the diSc; heat cannot fiow easily froIn the further side of the disc to the body portion Since it has fiTSt to paSS thfough the TfbS to the neaIof side of the disc, Which iS alfeady at a high ten1peratoTe. Thus in the conventiona1 disc the teInpeTatUTes and the TateS of cooling of the two sideS of the disc afe UnequaL the fUr thof Side of the diSc being Subiected to greater ten1poTa fuTes than the neafer Side relafivo to the body portion.

In a diSc according to the invention, alternate radially innef openingS to the venfilotion paSSageS are foffned in oI adjacent the Sufface of the diso vvhich is axially nearer to the base of the central diShed body poftion, inStead of all the openingS being in of adjacent the axially fuTthef Sufface, and tfliS leaveS relativoly vVide Solid poftionS di- Tecfly connecting the forther sido of the diSc to the body porfion, providing Inore neaTly equa1 heat conduction pathS ffom the two sides of the dfsc to the body poftion.

In addition to the ixnpToved cooling of the Side of the diSo aXiaHy fufther ffom the aSe of the cenffal diShed fody oortion, a f}fake diSc accofding to the invention has the advantage that the forthor sido of the diSc iS provided vvith a Inore rigid Tnechanical Support by itS connection to the body poTtion. The in1pfovod Tnechanfcal soppoft, together vith the beffel heat distTibl1fion in the diSc, TendefS the fllTthel side of the diSc leSS liable to cfack, of disinfog rafe in Sefvice, A1though the present invention iS il11Strated and deScTibed in connection With ceTtain ex aInple en1bodiInents, it vvill f)e undefStood that theSo aro illuStfative of the invention and afe by no IneanS feStTic tivo thefeof. It is Teasona bly to be expected that thoso skilled in the aTt can n1 ake numerouS roviSions and adap tations of the invention, and it is intended that soch fe visions and adaptations Will be included vvfthin the scopo of the fonowing olaiInS as equivalentS of the invention.

1Iaving now deScribed n1y invention, What 1 cfain1 iS:

1. A brake disc coInpfising a Tigid assembly of an annular oute1 disc portion and a contTal dished body pof tion, the diso poftion having foTIned therein a SerieS of cfrouInferentially Spaced fibs each dispoSed at an angle fo the radif of said diSc and a sefies of ciTcumfeTentiany spaced ventiIation passages tofminating in a series of openings fofmed at the o utef periphery of the diSc poftion and terminatin alSo in a SeTies of o enin s at the inner pefiphery of the disc poftion, Said openings at the inner periphery of Said diso poftion having a series of Hfst o enin s at circuInferentiaH -s aced ositions in the Side of the disc poftion adjacent the centfal dished fbody pof tion, and a SeTies of second o enin s foTmed at circumfeTentiall -s aced ositions in the side of Said disc ortion removed ffom the cenfral diShed body ponion, the second o enin s alternatin With the fi St o enin S around the Tadian inner eri heT of the disc oftion and eX- tendin into the axiall -extendin fadiaH inneT SuTface of the central dished bod oTtion to Tovide difect communication in a eneran radial diIoction with Tes ect to the bfake diSc betWeen the central dished poftion and the ventilation paSSages.

2. A disc bake accordin to claim 1 in which the angle of inclination of the ventHation paSSageS With re S ect to the direction of the adjacent Tadius of the disc is substantia11 30 de fees.

3. A brake disc accordin to claim 1 in Which adiacent assa es are se arated b said Tibs.

4. A bfake disc accofding to claim 1 in Which said passageS have at least one feinfofcing Iib disposed Within said assa eS and rovidin aXial stren th betWeen the sides of said disc. 4

5. A bfake disc acco ding to claim 1 in which the annularouter disoportion is cast inte raH With the cenfral diShed oody poItion.

o. A lbrake disc accordin to claim 1 in which ad acent paSSageS are spaced apaft eqUany ffom one anothef.

RefefenceS Ced UNITED STATES PATENTS 880,266 Z/ 1908 ASt. L7l7,ZZ 6/19Z9 RoSenbeTg 188-Z64 2 Z42 85 S/1941 FloWerS 188Z18 X Z,380 085 7/194S- Tack et al. 188Z18 MILTON BUCHLER, Pmor Exoe G. E. A. HALVOSA, Exomer. 

